<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Unable to call static member function from within the class own scope"
   href="https://bugs.llvm.org/show_bug.cgi?id=42504">42504</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unable to call static member function from within the class own scope
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>heavenandhell171@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>$ cat test.cpp
template <char Start, char End>
struct range {
  static_assert(range::validate());

  static constexpr auto validate() -> bool {
    return Start <= End;
  }
};

$ clang++ -std=c++17 test.cpp
test.cpp:3:24: error: no member named 'validate' in 'range<Start, End>'

  static_assert(range::validate());

                ~~~~~~~^

1 error generated.

This also doesn't work:

$ cat test.cpp
template <char Start, char End>
struct range {
  static constexpr bool valid = range::validate();

  static constexpr auto validate() -> bool {
    return Start <= End;
  }
};

$ clang++ -std=c++17 test.cpp
test.cpp:3:40: error: no member named 'validate' in 'range<Start, End>'

  static constexpr bool valid = range::validate();

                                ~~~~~~~^

1 error generated.</pre>
        </div>
      </p>


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